12x+13+7x-4=90

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Solution for 12x+13+7x-4=90 equation: 



12x+13+7x-4=90

We move all terms to the left:

12x+13+7x-4-(90)=0

We add all the numbers together, and all the variables

19x-81=0

We move all terms containing x to the left, all other terms to the right

19x=81

x=81/19

x=4+5/19

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